Electric filament-lamp.



T. ODONNELL.

ELECTRIC FILAMENT LAMP` ArjPLlcATmN man Nov. s. 19m.

Patented Jan. A1S, 1916.

,LUN-iran .THoMns ono'NNiaLL, osIRoNwoon Micrirean. d

EIEcTRIc EILAMENr-Lnrirp To all 'whom it may concern:

Be it known that I, THOMASl ODONNELL, a citizen of -the lUnited States,I residing at Ironwood, in :the county of Gogebic and State of Michigan, have invented certain` new and useful Improvements in Electric Fllament-Lamps, of which the following 1s a specification.

My invention relates to improvements in f electric lilament lamps.

An important object of the invention is to provide means whereby the candle power ofr the electric lamp may be greatly increased, without a corresponding increase in the cost of the manufacture of the same. A

A further object ofthe invention is to provide an electric lamp of the above mentioned character, which is simple in construction,.

inexpensive' to manufacture, and convenient 1n use.

Other objects and vadvantages of the in` vention will be apparent during the course of the following description.

As is well known, the ordinary electric ilament'lamp comprises a bulb, within which is arranged a single filament support or carrier, having the filament strung thereon. In such a lamp, it is customary to connect the lead-in wires with the filament by means of short sections of platinum wire. The lamp further comprises a socket element to be screw-threaded into a stationary supportlng -socket element. It is obvious that themost expensive parts of thelelectric lamp are thev platinum wires and socket element. AElectric lamps thus constructed are restricted 1n their candlepower, for certain sizes, and

when more light is needed, an increased number of lamps areused.

By my'constructiorn an electric lamp is :candle power of two or more electric lamps having filaments 'and sockets of corresponding size. In my lamp, the filament frame or y support` is arranged within the bulb, andv carries any suitable number of laterally spaced longitudinally extending branches or arms, over two, depending uponthe candle c power desired. The separate filaments of two or more electric lamps are thus combined inone lamp, such filaments being 1 strung upon the longitudinal arms.

[The advantage of my construction is that While a plurality of separate filaments are used, only two lead-in,wires,the connecting -candle power of my lamp.

i' Specicaton of Letters Patent. v Patented Jang 1S, 1916, A Applicationfiled..November6,1914i. Serial No. 870,570.

l quired, whereby the cost of manufacture of my lampdoes not substantially exceed the cost of the ordinary electric lamp having a lament of a correspondingsize, and'is greatly lbelow .the cost of a corresponding number of lamps, required to producethe In the accompanying drawings forming a part of this specification and in which like numerals are remployed to designate like parts throughout the same,

.Figure l is a side elevation of a lamp em-l bodying the invention, Fig. 2 is a plan view of the filament' support or carrier, and Fig. 3 is an enlarged side elevation of one longitudinal arm orbranch ofthe filament sup-A port or carrier. N

In the drawings wherein for the purpose of illustration is'show'n apreferred embodiment of my invention, the -numeral 22 designates a bulb, having a reduced neck 23. The

numeral 2l designates the filament frame orcarrier, to which is attacheda` crosshead 25, carrying arms or branches 26 pivoted thereto as shown at 27. Each branch 26 has a knee `ioint connectionwith the cross-Ahead, whereby the same may be swung inwardly and is positively prevented from swingingg' outwardly beyond a lpredetermined distance.'

Each .arm 26 is automatically swung outwardly upon being released by a leaf-spring 28 secured to thel cross-head, asshownA at 29.'

Strung upon the arms orbranches 26 are' filaments 30, as shown.

T hev support 24 is attached to glass tube 31, containing the leadfi'n lwires 32, connect.-

ed with short platinumA wires '33, in turn connected with vthe filaments to supply current thereto..` The filaments are shown as connected in parallel, while it is to be under-` stood that theyr maybe connected in series if desired.` The -tube 31 carries an annular iiange 3l adapted to be fused to the 'neck 23' forming an air' tight connection therewith.

The lead-in wires 32 are connected with contacts 31 and 31a, carried'by the neck 23, as shown.

In the manufacture of the lamp, the-support 2l attached to the tube 3l, and carrying the arms 26, is arranged-adjacent the neck 23. The arms 26 are now swung inwardly or collapsed by a suitable ltool whereby they may be passed through the neck. When arranged within the bulb, the arms are released claim 1. Asan artlcle of manufacture, an elecl whereby they automatically move to the outer position. The flange 3ft is then vfused to the neck 23, and the vacuum created inthe bulb'inI the usual manner. It is to be understood that the form of 'my invention herewith shown and described is -to be taken as a preferred example of the same, and-that various changes n1 the shapev Having thus described my invention, I

tric lamp, comprising a bulb having a contracted neck, a lament support-adapted to extend intothe bulb, extending arms pivoted to the support and extending longitudinally of the bulb, andlaments strung upon the arms.

As an article of manufacture,lan elec tric lamp, comprising a bulb having a contracted neck, a filament support adapted 1to be extended into the bulb, longitudinally extending arms pivoted to the support to swing outwardly fora predetermined distance, springs to automatically.. swing the arms outwardly, and filaments strungupon the arms.

In testimony whereof I afiix my signature in presence of two Witnesses.

, THOMAS ODONNELL'. fitnessesz SOLOMON W. PATEK, 1 HERMAN LARsoNLl 

